At the sulphur mine inside the crater of Ijen volcano
View over the crater
Ijen volcano's crater with the acid Kawah Ijen lake
Blue flames from burning sulphur illuminate the crater at night.
The most acide crater lake in the world
View of Kawah Ijen, a highly acid crater lake inside Ijen volcano's crater
Burning sulphur makes blue flames inside the crater of Ijen volcano
Sulphur workers at night
With the help of sulphur torches and gas masks, work continues even at night inside the crater of Ijen.
Glimpse of stars
View from the bottom of Ijen's crater at night; through the orange haze of thick gas and steam, parts of the night sky are still visible.
Mix of colors
Blue and red colors from burning sulphur and candles mix at night inside the crater of Ijen.
Tourists watch the blue flames of Ijen at night.